package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    // 创建业务层对象  多态
    UserService userService = new UserServiceImpl();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        req.setCharacterEncoding("UTF-8");
        String action = req.getParameter("action");
        if("list".equals(action)){
            //接收参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            User condtion=new User(name, pass);

            List<User> users = userService.findAll(condtion);
            req.setAttribute("users", users);
            // 转发
            req.getRequestDispatcher("/list.jsp").forward(req, resp);
        }
        else if("add".equals(action)){
            //拿到页面传递的参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.addUser(new User(name, pass));
            if (result > 0) {
                // 重定向  再次查询
                resp.sendRedirect("user?action=list");
            }
        }
        else if ("delete".equals(action)){
            //拿到页面传递的参数
            String sid = req.getParameter("id");
            int id= Integer.parseInt(sid);
            //根据id查询用户信息
            int result=userService.deleteUserById(id);
            if(result>0)
                req.getRequestDispatcher("/user?action=list").forward(req,resp);
            else
                resp.sendRedirect("/error.jsp");
        }
        else if ("update".equals(action)){
            String sid=req.getParameter("id");
            int id=Integer.parseInt(sid);
            //拿到页面传递的参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.updateUser(new User(id,name, pass));
            if (result > 0) {
                // 重定向  再次查询
                resp.sendRedirect("user?action=list");
            }
        }
        else if("toupdate".equals(action)){
            String sid = req.getParameter("id");
            Integer id= Integer.parseInt(sid);
            //根据id查询用户信息
            User user=userService.findById(id);
            //将对象存储在作用域中
            req.setAttribute("user",user);
            //转发到修改页面
            req.getRequestDispatcher("update.jsp").forward(req,resp);
        }
    }
}
